Malicious PDF — malware analysis report

Static analysis result for SHA-256 61baf63cf4dc3b20…

MALICIOUS

PDF

78.9 KB Created: 2021-08-09 23:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54ddb243a190f8f38bfc357c34264080 SHA-1: 1e324747af99e3ce5b33906c5842469b892b7e07 SHA-256: 61baf63cf4dc3b20fa6b3cfbbea195b844f7aeca295ed36aa897adc403794a15
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number intended for callback phishing or a tech support scam. Several URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting an attempt to host malicious content or redirect users. No scripts were extracted from this sample, but the overall structure and heuristics point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gmkms.net/upfile_editor/2021/files/53119253294.pdf In PDF document text
    • https://prawobrzeze.info/userfiles/file/48675599386.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb5bcbca45---mosopukijukak.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/70909923302.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072ccd793c2a---28888112.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1c05bd80dcf94f536b1c15bd67607ae3/84530724683.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/xijezojeliritujot.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/971npro2ronkpsdj86canmg6m7/fokaxo.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210614214557.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160952b54157ba---xejesopadavag.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160857b8bebce0---12977857137.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/wutorodufuwojada.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/tsnsd1edrkiacvpqtc3kvppghg/23553136660.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/87668091128.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8be5ba8fe9928f8345eaa196c8f49b6a/71175554109.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/96296428714.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607faebf70778---58854201204.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/49821801185.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/40b927bf5e1b07db34d15807d7ad1367/45044911231.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/229004be0745ac86c2b7241fddab437c/33652547975.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d72e61670---7898348167.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/36656604503.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/pavalipifugevivukigefeb.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/faterinimuzejanedada.pdfIn PDF document text
    • http://orem.mn/uploads/files/31499216165.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/liwivosenuzemaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=furious+challenger+electric+power+road+racing+set+instructionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC01 10956 bytes
SHA-256: 250a528e9d97fa760a31abc08a988b4a39931c46b878b9ef89f465c64b4f490c
font_01_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 17632 bytes
SHA-256: 9dcc274870bd7c3211dc1d8b82802a6a7ea78b8c0cd708338d8e545006322d06
font_02_sfnt_off00011306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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